ID:252002 File "<name>" is not a valid SignalTap II File

CAUSE: You turned on Enable SignalTap II Logic Analyzer and typed the specified SignalTap II File (.stp) name in the SignalTap II File name box in the SignalTap II Logic Analyzer page of the Settings dialog box. However, the specified file name is not a valid STP File.

ACTION: Click OK to close the message dialog box, and specify a valid STP File name, or turn off Enable SignalTap II Logic Analyzer.